Re: [PATCH] block: check more requests for multiple_queues in blk_attempt_plug_merge

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Hi Jens,

On Fri, Mar 11, 2022 at 6:16 AM Jens Axboe <axboe@xxxxxxxxx> wrote:
>
> On 3/10/22 5:07 PM, Jens Axboe wrote:
> > In any case, just doing larger reads would likely help quite a bit, but
> > would still be nice to get to the bottom of why we're not seeing the
> > level of merging we expect.
>
> Song, can you try this one? It'll do the dispatch in a somewhat saner
> fashion, bundling identical queues. And we'll keep iterating the plug
> list for a merge if we have multiple disks, until we've seen a queue
> match and checked.

This one works great! We are seeing 99% read request merge and
500kB+ average read size. The original patch in this thread only got
88% and 34kB for these two metrics.

Thanks,
Song

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